t: [X86 PATCH] Implement doubleword right shifts by 1 bit using
> s[ha]r+rcr.
> >
> >
> > This patch tweaks the i386 back-end's ix86_split_ashr and ix86_split_lshr
> > functions to implement doubleword right shifts by 1 bit, using a shift of
> the
> > high
Grr! I've done it again. ENOPATCH.
> -Original Message-
> From: Roger Sayle
> Sent: 06 October 2023 14:58
> To: 'gcc-patches@gcc.gnu.org'
> Cc: 'Uros Bizjak'
> Subject: [X86 PATCH] Implement doubleword right shifts by 1 bit using
s[ha]r+rcr.
>
>
> This
This patch tweaks the i386 back-end's ix86_split_ashr and ix86_split_lshr
functions to implement doubleword right shifts by 1 bit, using a shift
of the highpart that sets the carry flag followed by a rotate-carry-right
(RCR) instruction on the lowpart.
Conceptually this is similar to the recent
